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Chapter 4, Description of Fields
Fields
Chan Power
This field allows you to choose the CDMA Channel Power, Average Power, or
Access Probe Power measurements.
The CDMA Channel Power Measurement can be made on a signal connected to
the Test Set’s RF IN/OUT or ANTENNA IN connector.
This measurement must be cross-calibrated to the Average Power Meter. See
“Calibrating Channel Power Measurements” in the Calibrating the Test Set
chapter of the E8285A Application Guide.
An
Uncal annunciator will flash below this field when the Channel Power
measurement has not been calibrated for the frequency band selected in the RF
Chan Std field.
• Avg Power
Avg Power (Average Power) displays the average power measured from all
demodulated “on” power control groups transmitted by the mobile station under test.
The specified amplitude range of this measurement is from -10 dBm to +40 dBm, and
the input frequency range is from 30 MHz to 1000 MHz. This measurement is more
accurate than the Chan Power.
•
Chan Power
Chan Power (Channel Power) displays lower level RF power by analyzing the
downconverted IF at the Test Set’s DSP analyzer’s input. The amplitude range of this
measurement is from -50 dBm to +35 dBm. This measurement is limited to a 1.23
MHz bandwidth.
•
Acc Prb Pwr
Acc Prb Pwr (Access Probe Power) displays access probes from the mobile station
by automatically triggering a power measurement each time the mobile station
registers, performs a mobile station originated call, or performs a mobile station
terminated call. (Access Probe Power will also be displayed when SMS (Short
Message Service) or Authentication procedures are attempted on the Paging channel.
GPIB Examples
“DISP CTXT;CDMA:TX:POW:MEAS ‘Chan Power’”
selects Channel Power measurements.
“DISP CTXT;MEAS:CDM:CHAN?”
queries the channel power measurement.
“DISP CTXT;MEAS:CDM:CHAN:CAL”
calibrates channel power measurements (connect the DUPLEX OUT and
RF IN/OUT ports before sending this command).